Involute Gears. Introduction
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1 Involute Gears Introduction This lesson covers the development of involute gears. An involute gear is based on an involute curve, which is a mathematical shape. To understand what an involute is, consider a simple cylinder and a string as shown below. Wrap the string around the cylinder. While maintaining tension on the string, trace the path that the end of the string makes while un-wrapping it around the cylinder. This path is an involute curve. A simple cylinder and a string. Wrap the string around the cylinder. Pull Involute curve Pull the string tight and keep it tangent to the cylinder. Trace the end of the string while un-wrapping it around the cylinder. The resulting trajectory is an involute curve. There are two key parameters that control the involute curve: the diameter of the cylinder and the angle that the string is un-wrapped around the cylinder. In the example above, the string is un-wrapped 90º around the cylinder. CADQUEST 1
2 The Involute Curve Development of the mathematical equations for the involute curve uses simple trigonometry. We will develop the equations for 90º of one full involute. In other words, we are un-wrapping the string 90º around the cylinder in a counterclockwise direction. The circumference of a circle is defined by: c = 2 * p * r One quarter (90º) of the circumference of a circle is then: c = p * r / 2 In the figure below, the line s is the same length as the part of the circumference the string has been un-wrapped ( s ). x c, y c ang s r x, y s ang 0, 0 We are trying to define this curve by finding equations for x and y as (ang) changes Using trigonometry, we find that: x c = r * cos (ang) y c = r * sin (ang) x = x c + ( s * sin (ang)) y = y c ( s * cos (ang)) CADQUEST 2
3 Datum Curves From Equation In Pro/ENGINEER, datum curves can be defined using mathematical equations. When using this feature, a system variable t is used, that varies from 0 to 1 over the length of the curve. For the involute curve, let the angle (ang) be equal to t times 90. This means that the variable ang will vary from zero to 90º. To define s, we combine the circumference equation and t to form: s = ( p * r / 2 ) * t In this example, the diameter of the cylinder is This is the base diameter in gear design terminology. The radius of the cylinder is 0.75 inches. The equations for Pro/ENGINEER are: ang = t * 90 s = (PI * 0.75 * t ) / 2 x c = 0.75 * cos(ang) y c = 0.75 * sin(ang) x = x c + ( s * sin(ang)) y = y c ( s * cos(ang)) z = 0 The resulting datum curve is shown in bold below. CADQUEST 3
4 Creating the Gear In Pro/ENGINEER, the gear is started by modeling a cylinder at the outside diameter of the gear, see Figure 1. Several datum curves are created to define the root diameter, base diameter, and pitch diameter of the gear, see Figure 2. Next, the involute shaped datum curve is created and moved into the correct position to define one side of one gear tooth, see Figure 3. The curve is mirrored and the gear tooth is cut into the cylinder using the edge of the involute datum curves, see Figure 4. The cut is patterned and rounds are added at the base of the gear. The completed gear is shown in Figures 5 and 6. Figure 1 Figure 2 Figure 3 Involute curve Figure 4 Figure 5 Figure 6 CADQUEST 4
5 Gear Parameters The following are geometric parameters in gear design: Pitch Diameter Diametral Pitch = Pitch Diameter + ( 2 * Addendum ) Root Diameter Circular Pitch = π / Pitch Diameter Outside Diameter Number of Teeth = Diametrical Pitch * Pitch Diameter Base Diameter Pressure Angle Addendum Dedendum Tooth Thickness Tooth Thickness Angle Fillet Size The figure describes some of the gear parameters. Outside diameter Tooth thickness angle Pitch diameter Tooth thickness Base diameter Addendum Root diameter Dedendum Fillet size Gear Parameters CADQUEST 5
6 EXERCISE INVOLUTE GEARS Task 1: Create a new part with a datum curve driven by an equation. Use File, New, pick the Part button, enter < involute > for the name, pick Copy From and pick the inch start part from the list, then press the middle mouse button Create a datum curve using #Feature; #Create; #Datum; #Curve; #From Equation; #Done For the coordinate system, pick CS0 then pick #Cartesian In the Notepad window, add the following equations: r = ang = t * 90 s = (PI * r * t ) / 2 xc = r * cos(ang) yc = r * sin(ang) x = xc + ( s * sin(ang)) y = yc - ( s * cos(ang)) z = 0 Save and Exit Notepad then pick OK in the dialog box or press the middle mouse button The result is shown below. This curve will be used to create an involute gear. Pick File, Save and press the middle mouse button CADQUEST 6
7 Task 2: Create a cylinder at the outside diameter of the gear. Create an extruded protrusion sketched on DTM3, flip the direction arrow to point from the red side of DTM3 Sketch a circle centered on DTM1 and DTM2, with a diameter of which is the outside diameter of the gear (see the figure on page 5) Use a blind depth of Task 3: Create three datum curves representing the major diameters. Create a datum curve sketched on DTM3 with a diameter of to represent the root diameter of the gear Create a datum curve sketched on DTM3 with a diameter of to represent the base diameter of the gear Create a datum curve sketched on DTM3 with a diameter of to represent the pitch diameter of the gear Task 4: Create two datum points and a datum curve. Create a datum point at the intersection of the involute curve and the diameter circle using the #Crv X Crv option Create a datum point at the intersection of datums DTM1, DTM2, and DTM3 using the #Three Srf option Create a datum curve through the two datum points using the #Thru Points option Task 5: Create a datum evaluate feature. Create a datum evaluate feature Name the feature measure Name the measurement parameter angle Measure the angle between the last curve you created and DTM2 CADQUEST 7
8 Task 6: Copy the involute curve. Copy the involute curve using #Feature; #Copy; #Move; #Dependent; #Done Pick the involute curve then pick #Done; #Rotate; #Crv/Edg/Axis Pick the axis in the center of the cylinder then pick #Okay Enter < 30 > for the angle then pick #Done Move; OK; #Done Task 7: Add a relation using Modify. #Modify the angle dimension of the copied involute curve Enter: angle:fid_measure + ( 7.5 / 2 ) Answer < Y > to add the relation #Regenerate the part Task 8: Mirror the copied involute curve. Mirror the copied involute datum curve about DTM2 using #Feature; #Copy; #Mirror; #Dependent; #Done Read the prompts Task 9: Copy the curve again. Copy the same copied curve (the one created in task 6) again using #Feature; #Copy; #Move; #Dependent; #Done Pick the curve then pick #Done; #Rotate; #Crv/Edg/Axis Pick the axis in the center of the cylinder then pick #Flip; #Okay Enter < 15 > for the angle then pick #Done Move; #Done; OK; #Done CADQUEST 8
9 Task 10: Create an extruded cut. Create an extruded (thru all) cut using the edges of the curves as shown below Trim the sketch using #Geom Tools; #Trim Add these two lines, be sure to get the tangency constraint as shown Pick #Use Edge then select these curves Task 11: Copy the cut. Copy the cut using #Feature; #Copy; #Move; #Dependent; #Done Pick the cut then pick #Done; #Rotate; #Crv/Edg/Axis CADQUEST 9
10 Pick the axis in the center of the cylinder then pick #Flip; #Okay Enter < 15 > for the angle then pick #Done Move; #Done; OK; #Done Task 12: Pattern the copied cut. Pattern the copied cut, enter < 15 > for the increment, use 23 for the number of instances in the pattern Task 13: Finish the part. Create a round at the base of the gear tooth Pattern the round Create a coaxial hole with a diameter of The part is shown without the datum curves (Hint: Use layers) Save the part and Close the window CADQUEST 10
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